/*
 * Copyright 2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.ai.autoconfigure.vectorstore.cassandra;

import java.time.Duration;

import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.config.DefaultDriverOption;

import io.micrometer.observation.ObservationRegistry;

import org.springframework.ai.embedding.BatchingStrategy;
import org.springframework.ai.embedding.EmbeddingModel;
import org.springframework.ai.embedding.TokenCountBatchingStrategy;
import org.springframework.ai.vectorstore.CassandraVectorStore;
import org.springframework.ai.vectorstore.CassandraVectorStoreConfig;
import org.springframework.ai.vectorstore.observation.VectorStoreObservationConvention;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration;
import org.springframework.boot.autoconfigure.cassandra.DriverConfigLoaderBuilderCustomizer;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;

/**
 * @author Mick Semb Wever
 * @author Christian Tzolov
 * @author Soby Chacko
 * @since 1.0.0
 */
@AutoConfiguration(after = CassandraAutoConfiguration.class)
@ConditionalOnClass({ CassandraVectorStore.class, CqlSession.class })
@EnableConfigurationProperties(CassandraVectorStoreProperties.class)
public class CassandraVectorStoreAutoConfiguration {

	@Bean
	@ConditionalOnMissingBean(BatchingStrategy.class)
	BatchingStrategy batchingStrategy() {
		return new TokenCountBatchingStrategy();
	}

	@Bean
	@ConditionalOnMissingBean
	public CassandraVectorStore vectorStore(EmbeddingModel embeddingModel, CassandraVectorStoreProperties properties,
			CqlSession cqlSession, ObjectProvider<ObservationRegistry> observationRegistry,
			ObjectProvider<VectorStoreObservationConvention> customObservationConvention,
			BatchingStrategy batchingStrategy) {

		var builder = CassandraVectorStoreConfig.builder().withCqlSession(cqlSession);

		builder = builder.withKeyspaceName(properties.getKeyspace())
			.withTableName(properties.getTable())
			.withContentColumnName(properties.getContentColumnName())
			.withEmbeddingColumnName(properties.getEmbeddingColumnName())
			.withIndexName(properties.getIndexName())
			.withFixedThreadPoolExecutorSize(properties.getFixedThreadPoolExecutorSize());

		if (!properties.isInitializeSchema()) {
			builder = builder.disallowSchemaChanges();
		}
		if (properties.getReturnEmbeddings()) {
			builder = builder.returnEmbeddings();
		}

		return new CassandraVectorStore(builder.build(), embeddingModel,
				observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP),
				customObservationConvention.getIfAvailable(() -> null), batchingStrategy);
	}

	@Bean
	public DriverConfigLoaderBuilderCustomizer driverConfigLoaderBuilderCustomizer() {
		// this replaces spring-ai-cassandra-*.jar!application.conf
		// as spring-boot autoconfigure will not resolve the default driver configs
		return (builder) -> builder.startProfile(CassandraVectorStore.DRIVER_PROFILE_UPDATES)
			.withString(DefaultDriverOption.REQUEST_CONSISTENCY, "LOCAL_QUORUM")
			.withDuration(DefaultDriverOption.REQUEST_TIMEOUT, Duration.ofSeconds(1))
			.withBoolean(DefaultDriverOption.REQUEST_DEFAULT_IDEMPOTENCE, true)
			.endProfile()
			.startProfile(CassandraVectorStore.DRIVER_PROFILE_SEARCH)
			.withString(DefaultDriverOption.REQUEST_CONSISTENCY, "LOCAL_ONE")
			.withDuration(DefaultDriverOption.REQUEST_TIMEOUT, Duration.ofSeconds(10))
			.withBoolean(DefaultDriverOption.REQUEST_DEFAULT_IDEMPOTENCE, true)
			.endProfile();
	}

}
